Chapter 2: C4/C4c CMTS Features
STANDARD Revision 1.0 C4® CMTS Release 8.3 User Guide
© 2016 ARRIS Enterprises LLC. All Rights Reserved. 56
DOCSIS 1.1 DSx/DQOS and PacketCable 1.x Voice Scalability Improvements with Respect to Release 4.2:
MTAs/downstream (1D) 1,000 (no change)
MTAs/downstream (2D) 1,500 (no change)
MTAs/C4 equipped w/GNAMs 26,666
Lines/downstream 1,800 (no change)
Lines/C4 32,000
BHCA/downstream 5,000 (no change)
BHCA/C4 90,000
Simultaneous half calls/downstream 260 (no change)
Connections/second per chassis 25
Cable Modem Deny List
CPE Host Authorization
Configure Cable Modem Vendor OUI
Show Cable Modem Columns.
Note: These call capacities assume that the C4 CMTS is equipped with GNAMs. If the chassis is equipped with Ethernet
NAMs, the number of MTAs supported is only 10,000.
Dynamic Load Balancing — The Dynamic Load Balancing feature automatically moves modems from one upstream
channel to another, or from one downstream to another (including from one 2Dx12U CAM to another). Requires 2Dx12U
CAMs.
Legal Intercept — Legal Intercept provides the MSOs a mechanism for meeting legal requirements to intercept all IP data
and voice traffic originated or sent to subscribers on the cable network. Legal Intercept is based on Cisco’s implementation
described in RFC 3924. The C4 CMTS interprets SNMP SET/GETs to enable/clear/display subscriber taps and send
intercepted packets to the Mediation Device.
PIM-SSM — PIM-SSM (Source Specific Multicast) provides the capability to request multicast traffic from a single source
and build a source path tree (SPT) from the edge router back to the source of the multicast stream. It also contains
requirements to provide SSM multicast data plane counts.
IGMP ACLs — IGMP ACLs provide the ability to limit what multicast groups can be joined on an interface by using a
standard ACL to indicate what groups are allowed to be joined.
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